Problem Statement SummaryCary Graphic Arts Collection maintains a collection of iron printing presses from the 19th century onward. They would like to expand this collection to include the earlier style of printing press, the wooden common press.
The team will deliver a full scale, working reconstruction of a wooden common press for display at the Cary Graphic Arts collection. This will be accompanied by detailed drawings, manufacturing, and assembly instructions.
More details available on the Problem Definition page.
Team Vision for System-Level Design PhaseSummarize: During the system level design phase, the team will look for existing presses that can be studied and Goals:
- Create functional decomposition
- Create morphological table
- Contact with owners of surviving wooden presses
- Collect measurements of surviving presses.
- Identify possible materials
- Created functional decomposition
- Created morphological table
- Contacted nine owners of presses including Mackenzie Printery and Newspaper Museum, Newport Historical Society.
- Visited Mackenzie Printery and Newspaper Museum; collected measurements
- Found engineering drawings of the Benjamin Franklin press
- Established a list of woods likely used for construction
- First blog post to American Printing History Association
BenchmarkingSurviving or documented wooden presses will serve as the primary benchmark for the project. Several presses have been identified as suitable candidates, however dimensions are not widely available. The team will visit these presses over the course of the project and gather measurements and build upon this benchmarking table.
- The working Benchmarking Table: Benchmarking Table
Morphological Chart and Concept Selection
The team has been tasked with created a reconstruction of a wooden printing press. In order to maintain historical accuracy, the possible solutions must be features on presses of that time period. Working within these constraints, the figure below contains the possible solutions for functions of the press that are representative of reference material.
Several possible concepts were pulled from the morphological chart. Seeing as some attributes are restricted to only one solution, those were not included in the analysis. The concepts were evaluated against the selection criteria using the printing press at the Mackenzie Printery Museum as a datum.
Concept SelectionThe concepts will be evaluated according to the following selection criteria:
- Historically accurate
- Within time period
- Elements seen on English presses
- Machinable without modern power tools (Meet historical accuracy)
- Likelihood of failure (lower is better)
Energy, Information, and Material Flow
System AssemblyThe following images show the complete system assembly of an example wooden press.*
* Images from: Harris, Elizabeth, and Clinton Sisson. The Common Press: Being a Record, Description Delineation of the Early Eighteenth-century Handpress in the Smithsonian Institution. London: Merrion, 1978. Print.
Feasibility: Prototyping, Analysis, Simulation
Load on the girts
Question:How much would it weight to fill the entire printable area with lead? What dimensions do the girts need to be to carry the load?
- Linotype alloy: 4%Sn, 12% Sb, 84%Pb; specific gravity = 0.30 lbs/in3; Properties from Rotometals.com
- Max printable area is twice the area of the platten: 295 in2
- Type high = 0.918 in, approximately = 1.0 in
Comments:In theory, the form would be at most 177lbs, not including the chase (which would be the same for all locked up forms), meaning the girts must accommodate that load plus that of the bed of the press (including the coffin, plank, stone, etc.).
QuestionWhat design is considered aesthetically pleasing? Can we assess before woodworking and manufacturing?
ApproachResearch common wood design of the era, create prototype, collect response from customer and random sample.
AnalysisConstruct prototype - 3D printing or Foam
Example PrototypesPrototypes to be added later
Future Feasibility AnalysesOnce 3D modeling has been completed, the next analyses to performed would be:
- Stress analysis on cheeks
- Structural effects of location of winter, bar, rounce
- Ergonomics for people then versus now
- The working risk register document: Risk register